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2x+3x+4x = 180°
9x = 180°
x= 180°/9 = 20°
sudutnya:
2x= 2(20) =40°
3x= 3(20)=60
4x=4(20)= 80°
2. 6x + (40+3x)+(30+x)= 180
10x + 70 = 180
10x = 110
x = 110/10
x= 11°